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M451
May. 4, 2018
Page
602
of
1006
Rev.2.08
M4
51
S
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RI
E
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CH
NICA
L RE
F
E
R
E
NC
E
M
A
NU
A
L
nCTS pin input
Active
nCTS pin input status of UART function mode
D0
D1
D2
D3
D4
D5
D6
D7
P
Start
bit
Stop
bit
TX pin output
MODEM_ INT interrupt
Clear by softwave
MODEM_ INT interrupt
Clear by softwave
Idle
Idle
TX output
delay
(default)
CTSSTS
UART_MODEMSTS[4]
CTSACTLV=0
CTSACTLV=1
CTSDETF
Figure 6.13-9 UART nCTS Auto-Flow Control Enabled
The Figure 6.13-10 demonstrates the nRTS auto-flow control of UART function mode. User must
set ATORTSEN (UART_INTEN[12])=1 to enable nRTS auto-flow control function. The nRTS
internal signal is controlled by RTSTRGLV (UART_FIFO[19:16]) trigger level, if the number of
data bytes in RX FIFO is equal to or greater than RTSTRGLV (UART_FIFO[19:16]), the nRTS is
de-asserted. Setting RTSACTLV(UART_MODEM[9]) can control the nRTS pin output is inverse
or non-inverse from nRTS signal. User can read the RTSSTS (UART_MODEM[13]) bit to get real
nRTS pin output voltage logic status.
RTSACTLV = 0
nRTS Signal
(internal signal)
Active
Byte(i)
Byte (i +n)
Start
bit
RX pin input
( from external)
RTS inactive
delay
External
delay
Start
bit
The Bytes
Number Stored
In FIFO
<
The Bytes Number
Stored In FIFO
=
nRTS pin output status of UART function mode, nRTS auto - flow control enabled
RTSTRGLV
(UART_FIFO[19:16]
RTSTRGLV
(UART_FIFO[19:16])
RTSSTS
(UART_MODEM[13])
nRTS pin output
RTSACTLV = 1
(Default)
Figure 6.13-10 UART nRTS Auto-Flow Control Enabled
As shown in the Figure 6.13-11, in software mode (ATORTSEN(UART_INTEN[12])=0), the nRTS
Содержание ARM Cortex NuMicro M451 Series
Страница 301: ...M451 May 4 2018 Page 301 of 1006 Rev 2 08 M451 SERIES TECHNICAL REFERENCE MANUAL...
Страница 324: ...M451 May 4 2018 Page 324 of 1006 Rev 2 08 M451 SERIES TECHNICAL REFERENCE MANUAL Figure 6 4 18 Checksum Calculation Flow...
Страница 355: ...M451 May 4 2018 Page 355 of 1006 Rev 2 08 M451 SERIES TECHNICAL REFERENCE MANUAL 2 0 Reserved Reserved...
Страница 625: ...M451 May 4 2018 Page 625 of 1006 Rev 2 08 M451 SERIES TECHNICAL REFERENCE MANUAL 00 5 bits 01 6 bits 10 7 bits 11 8 bits...
Страница 721: ...M451 May 4 2018 Page 721 of 1006 Rev 2 08 M451 SERIES TECHNICAL REFERENCE MANUAL the SCL line 1 0 Reserved Reserved...
Страница 1001: ...M451 May 4 2018 Page 1001 of 1006 Rev 2 08 M451 SERIES TECHNICAL REFERENCE MANUAL LQFP 64L 10x10x1 4 mm footprint 2 0 mm 9 2...
Страница 1002: ...M451 May 4 2018 Page 1002 of 1006 Rev 2 08 M451 SERIES TECHNICAL REFERENCE MANUAL LQFP 64L 7x7x1 4 mm footprint 2 0 mm 9 3...
Страница 1003: ...M451 May 4 2018 Page 1003 of 1006 Rev 2 08 M451 SERIES TECHNICAL REFERENCE MANUAL LQFP 48L 7x7x1 4mm footprint 2 0mm 9 4...